The first principle of truth is a knowable, transcendent and unchanging reality (fixed point or referent). In this respect, it can be demonstrated that the truth about reality can be known or discovered.
There are only two sides with respect to statements about reality, the side of error and the side of truth.
John 18:37 – “For this reason I was born, and for this I came into the world, to testify to the truth. Everyone on the side of truth listens to me.”
By definition, truth is a statement or idea that corresponds to reality (God). The Spirit of God is the fixed point of reality (1 John 5:6 “The Spirit is the truth) and God’s Word is truth because it matches reality (In John 17:17 Jesus said, “your word is truth.”).
Jesus is the truth because he perfectly corresponds to God In John 14:6 Jesus said, “I am the truth.”
In Hebrews 1:3 we read, “The Son is the radiance of God's glory and the exact representation of his being.”